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Manipal Entrance Test 2017 Physics Paper
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© examsnet.com
Question : 17
Total: 50
The plane faces of two identical plano-convex lenses each having a focal length of
50
cm
are placed against each other to form a usual biconvex lens. The distance from this lens combination at which an object must be placed to obtain a real, inverted image which has the same size as the object is
50
cm
25
cm
100
cm
40
cm
Validate
Solution:
The focal length of the combination is
1
F
=
1
f
1
+
1
f
2
Given,
f
1
=
50
c
m
,
f
2
=
50
c
m
∴
1
F
=
1
50
+
1
50
=
2
50
⇒
F
=
50
2
=
25
c
m
Object when placed at centre of curvature forms a real, inverted image of same size as object
=
(
2
×
2
5
=
50
c
m
)
.
© examsnet.com
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